Abstract

Abstract A Theoretical model for identifying the flow regime transition of air-water two-phase flow in a horizontal pipe is presented. In this work, when mapping the two-phase flow, the nonuniform liquid-to-wall shear stress around the pipe circumference and the interfacial shear stress were taken into consideration. This model was found in agreement with the experimental map of Mandhane et al. (1974) and the Modified Baker map (Ball et al. 1970) for mapping the two-phase flow. The proposed model is plotted for different pipe diameters. The superficial liquid velocity was found to increase four times in the stratified and bubble flow regimes when the pipe diameter was increased from 2.5 to 5 cm. This model enables for any user for working in different diameters.

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